Nastase, Horatiu [UNESP]Weltman, Amanda2014-05-272014-05-272013-09-30Journal of High Energy Physics, v. 2013, n. 8, 2013.1126-67081029-8479http://hdl.handle.net/11449/76658We modify the ansatz for embedding chameleon scalars in string theory proposed in [1] by considering a racetrack superpotential with two KKLT-type exponentials e ia instead of one. This satisfies all experimental constraints, while also allowing for the chameleon to be light enough on cosmological scales to be phenomenologically interesting. © 2013 SISSA, Trieste, Italy.engCosmology of Theories beyond the SMdS vacua in string theorySupergravity ModelsArtigo10.1007/JHEP08(2013)059WOS:000324113700059Acesso aberto2-s2.0-848845615112-s2.0-84884561511.pdf